Combined tar extractor and gas exhauster



R. H. REED COMBINED TAR EXTRACTOR ANDGAS EXHAUSTER Dec' 27 Patented ec. 2, 1924.

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ROBERT H. REED, OF EASTON, PENNSYLVANIA, ASSIGNOR TU INGERSOLL-RAND COM- PANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

COMBINED TAR,EXTRAOTOR AND GAS EXHAUSTER.

4application filed April so, 1924. kserial no. 709,945.

To all whom t may concern: l n

ABeit known that I, ROBERT I-I. REED, a citizen of the United States, and a resident of Easton, county of Northampton, and State of Pennsylvania, have invented a certain Combined Tar Extractor and Gas Exhauster, of which the following is a specication accompanied by drawings.

This invention relates to blowers and pumps and possessesfeatures of general application -which are more particularly adapted `for use in apparatus for exhausting and pumping gas which contains in suspensionA heavier substances, such as tar and the like.

In the process of manufacturing illuminating gas by distillation of coal and other substances, it is usually found that slight quantities of tar are carried over in suspension by the gas which later separate and become troublesome in that they collect on the walls of the pipe lines and conduits by which the gas is conveyed.

It is an object of this invention to separate the tar from the gas by which it has been held in suspension, preferably by means of a separator integrally formed with the blower or exhauster. This object is accomplished by the invention in its improved form by accelerating` the gas to a high velocity and passing it through devious paths to change the direction of flow, whereby the tar is thrown out of suspension by its tendency to resist a change of direction due to its greater mass.

The invention will be more clearly understood by reference to the following description taken in conjunction with the accompanying drawings, in which- Figure 1 is a vertical longitudinal section of part of a blower embodying the tar separating means, this section being taken along the line 1--1 of Figure 2 looking in the direction of the arrows, and

Figure 2 is a cross section of the blower along the line 2 2 of Figure l looking in the direction of the arrows.

The exhauster includes a casing A within which are housed a plurality of impellers B, C and D rigidly mounted on a shaft E for rotation therewith. Gas is adapted to be drawn from a supply pipe F through an inlet G to the first stage impeller B by which it is compressed and passed on through intermediate pressure chambers H, J and K to the successive higher stage impellers C and D.

' The shaft 'n is .provided with a Suitable journal L and water seal O at the inlet and discharge end of the shaftto prevent the. escape of gas to atmosphere al-ong the shaft.

Each ot the impellers is provided with a diiuser, those corresponding with the impellers C and D being shown atlD and Q respectively. The diffuser R which cooperates with the impeller Bis formed by a casing head S and the casing A, there being provided a flange T forming one side of the diffuser. l A

In accordance with the practice 'of this invention the tar carried in suspension by the gas is separated by centrifugal action, that is to say the gas and the tar are brought to a high velocity and then passed through a number of relatively sharp turns which causes the heavy liquid or semi-solid matter to be thrown outwardly and to be separated from the gas, which, being lighter, is readily deflected.

In this embodiment the separation is arranged to take place at the lirst stage of' compression of the gas. It is understood,

however, that each or any stage may be equipped with similar separating apparatus. High velocity is imparted to the gas entering the blower by means of the impeller B. The gas is project/ed into the diffuser R wherein its velocity is substantially main-l tained by means of vanes U, which are triangular in form to partly fill the diffuser throat R for the purpose of maintaining a substantially constant cross section from the entrance to the exhaust of the diffuser. The velocity of the gas leaving the diuser R is therefore substantially the same as its velocity on entering. At the end of the difuser R the vpath of the gas takes a sharp turn as at V, and adjacent this point there is provided a passageway W leading to an annular chamber X. The tar, being relatively heavy as compared with the gas, will be projected radially outward through the passageway W and collect in the chamber X.

The tar collecting in the chamber X collects by gravity in a sump Y from which it may be withdrawn through a suitable drain Z. After the gas is turned at B the flow is kept in a circular path so as to throw out any heavy matter which may still be in suspension to collect on the inner wall of the casing head S whence it may drop down into annular chambers a and b, which are separated by a rib e to provide dead space for the collected tar. The gas then passes transversely across the dii'l'us-er R through apertures c in the vanes U into the intermediate pressure chamber H.

Toward the lower side of the casing head S the outermost chamber a is separated Yfrom the chamber b by a partition l so as to prevent the current of gas from picking up the tar as it drops to the bottom. Also in the lower half ofthe casing head S the chainber a Vcommunicates directly with the annir lar chamber X so that the tar may drop .j 'freely into the sump Y.

I claim: l l. A combined exhauster and tar eX- tractor for gas comprising a casing, an imp'eller rotatably mounted Within said casing, a diuser, means for passing the gas from said diii'user through a plurality of sharp turns int'zluding` vanes disposed in said diiuser provided with apertures extending transversely across said d ijuser and chambers adjacent such sharpy turns for collecting the tar centrifugally separated from said gfl 2. A combined kegrhauster and tar eX- tractor for gas comprising a casing, an impeller rotatably mounted within said casing, a casing head, a diffuser formed integrally with 'said easing and said casing head, an annular chamber in saidy casing head adjacent said diuser to receive tar centrif# ugally separated from said gas, means' for guidii'ig the gas through a plurality of sharp turns includingsaid casnghead and vanes disposed in said diffuser having apertures extending transversely across said diffuser, tar collectingchambers adjacent such sharp turns and a sump associated with all of said chambers.'

In testimony whereof I have signed this specification.

ROBERT H. REED, 

